Earth & Environmental Sciences
agricultural worker
15%
basin
5%
bird
8%
chronology
65%
climate
21%
cold
7%
coniferous tree
10%
cross section
8%
dating
7%
disturbance
7%
document
7%
drought
63%
El Nino-Southern Oscillation
39%
famine
26%
food production
10%
habitat
6%
immigration
11%
index
20%
infiltration
8%
land
5%
livestock
9%
moisture
15%
mortality
7%
program
10%
protected area
9%
rain
7%
rate
3%
runoff
7%
rural area
9%
soil
8%
Southern Oscillation
12%
spectral analysis
9%
standardization
10%
stem
9%
summer
5%
temperature
3%
tree ring
86%
trend
5%
water
3%
water resource
7%
watershed
7%
wildlife
8%
winter
12%
Social Sciences
age difference
11%
agricultural product
21%
climate
31%
conservation
8%
drought
100%
event
5%
farm worker
14%
food
7%
habitat
11%
immigration
8%
indication
8%
management
4%
Mexico
64%
migrant
7%
mortality
8%
reconstruction
35%
rural area
8%
subversion
12%
trend
4%
water
7%
Water resources
11%